As for me, I mainly play a buffing class. I think I use SEQ the most to find all the level/classes of my party. Then after that would have to be navigation.
I very rarely any more use it to find mobs in my level range. Very seldomly do I use it to locate a "rare" (ironic since I run a SEQ filter site) and only occasionally do I use it to locate a person or npc for a quest.